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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * CIPSO - Commercial IP Security Option
4 *
5 * This is an implementation of the CIPSO 2.2 protocol as specified in
6 * draft-ietf-cipso-ipsecurity-01.txt with additional tag types as found in
7 * FIPS-188, copies of both documents can be found in the Documentation
8 * directory. While CIPSO never became a full IETF RFC standard many vendors
9 * have chosen to adopt the protocol and over the years it has become a
10 * de-facto standard for labeled networking.
11 *
12 * Author: Paul Moore <paul@paul-moore.com>
13 */
14
15/*
16 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
17 */
18
19#ifndef _CIPSO_IPV4_H
20#define _CIPSO_IPV4_H
21
22#include <linux/types.h>
23#include <linux/rcupdate.h>
24#include <linux/list.h>
25#include <linux/net.h>
26#include <linux/skbuff.h>
27#include <net/netlabel.h>
28#include <net/request_sock.h>
29#include <linux/atomic.h>
30#include <linux/refcount.h>
31#include <asm/unaligned.h>
32
33/* known doi values */
34#define CIPSO_V4_DOI_UNKNOWN 0x00000000
35
36/* standard tag types */
37#define CIPSO_V4_TAG_INVALID 0
38#define CIPSO_V4_TAG_RBITMAP 1
39#define CIPSO_V4_TAG_ENUM 2
40#define CIPSO_V4_TAG_RANGE 5
41#define CIPSO_V4_TAG_PBITMAP 6
42#define CIPSO_V4_TAG_FREEFORM 7
43
44/* non-standard tag types (tags > 127) */
45#define CIPSO_V4_TAG_LOCAL 128
46
47/* doi mapping types */
48#define CIPSO_V4_MAP_UNKNOWN 0
49#define CIPSO_V4_MAP_TRANS 1
50#define CIPSO_V4_MAP_PASS 2
51#define CIPSO_V4_MAP_LOCAL 3
52
53/* limits */
54#define CIPSO_V4_MAX_REM_LVLS 255
55#define CIPSO_V4_INV_LVL 0x80000000
56#define CIPSO_V4_MAX_LOC_LVLS (CIPSO_V4_INV_LVL - 1)
57#define CIPSO_V4_MAX_REM_CATS 65534
58#define CIPSO_V4_INV_CAT 0x80000000
59#define CIPSO_V4_MAX_LOC_CATS (CIPSO_V4_INV_CAT - 1)
60
61/*
62 * CIPSO DOI definitions
63 */
64
65/* DOI definition struct */
66#define CIPSO_V4_TAG_MAXCNT 5
67struct cipso_v4_doi {
68 u32 doi;
69 u32 type;
70 union {
71 struct cipso_v4_std_map_tbl *std;
72 } map;
73 u8 tags[CIPSO_V4_TAG_MAXCNT];
74
75 refcount_t refcount;
76 struct list_head list;
77 struct rcu_head rcu;
78};
79
80/* Standard CIPSO mapping table */
81/* NOTE: the highest order bit (i.e. 0x80000000) is an 'invalid' flag, if the
82 * bit is set then consider that value as unspecified, meaning the
83 * mapping for that particular level/category is invalid */
84struct cipso_v4_std_map_tbl {
85 struct {
86 u32 *cipso;
87 u32 *local;
88 u32 cipso_size;
89 u32 local_size;
90 } lvl;
91 struct {
92 u32 *cipso;
93 u32 *local;
94 u32 cipso_size;
95 u32 local_size;
96 } cat;
97};
98
99/*
100 * Sysctl Variables
101 */
102
103#ifdef CONFIG_NETLABEL
104extern int cipso_v4_cache_enabled;
105extern int cipso_v4_cache_bucketsize;
106extern int cipso_v4_rbm_optfmt;
107extern int cipso_v4_rbm_strictvalid;
108#endif
109
110/*
111 * DOI List Functions
112 */
113
114#ifdef CONFIG_NETLABEL
115int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
116 struct netlbl_audit *audit_info);
117void cipso_v4_doi_free(struct cipso_v4_doi *doi_def);
118int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info);
119struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
120void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def);
121int cipso_v4_doi_walk(u32 *skip_cnt,
122 int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
123 void *cb_arg);
124#else
125static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
126 struct netlbl_audit *audit_info)
127{
128 return -ENOSYS;
129}
130
131static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
132{
133 return;
134}
135
136static inline int cipso_v4_doi_remove(u32 doi,
137 struct netlbl_audit *audit_info)
138{
139 return 0;
140}
141
142static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
143{
144 return NULL;
145}
146
147static inline int cipso_v4_doi_walk(u32 *skip_cnt,
148 int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
149 void *cb_arg)
150{
151 return 0;
152}
153
154static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def,
155 const char *domain)
156{
157 return -ENOSYS;
158}
159
160static inline int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def,
161 const char *domain)
162{
163 return 0;
164}
165#endif /* CONFIG_NETLABEL */
166
167/*
168 * Label Mapping Cache Functions
169 */
170
171#ifdef CONFIG_NETLABEL
172void cipso_v4_cache_invalidate(void);
173int cipso_v4_cache_add(const unsigned char *cipso_ptr,
174 const struct netlbl_lsm_secattr *secattr);
175#else
176static inline void cipso_v4_cache_invalidate(void)
177{
178 return;
179}
180
181static inline int cipso_v4_cache_add(const unsigned char *cipso_ptr,
182 const struct netlbl_lsm_secattr *secattr)
183{
184 return 0;
185}
186#endif /* CONFIG_NETLABEL */
187
188/*
189 * Protocol Handling Functions
190 */
191
192#ifdef CONFIG_NETLABEL
193void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
194int cipso_v4_getattr(const unsigned char *cipso,
195 struct netlbl_lsm_secattr *secattr);
196int cipso_v4_sock_setattr(struct sock *sk,
197 const struct cipso_v4_doi *doi_def,
198 const struct netlbl_lsm_secattr *secattr);
199void cipso_v4_sock_delattr(struct sock *sk);
200int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
201int cipso_v4_req_setattr(struct request_sock *req,
202 const struct cipso_v4_doi *doi_def,
203 const struct netlbl_lsm_secattr *secattr);
204void cipso_v4_req_delattr(struct request_sock *req);
205int cipso_v4_skbuff_setattr(struct sk_buff *skb,
206 const struct cipso_v4_doi *doi_def,
207 const struct netlbl_lsm_secattr *secattr);
208int cipso_v4_skbuff_delattr(struct sk_buff *skb);
209int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
210 struct netlbl_lsm_secattr *secattr);
211unsigned char *cipso_v4_optptr(const struct sk_buff *skb);
212int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option);
213#else
214static inline void cipso_v4_error(struct sk_buff *skb,
215 int error,
216 u32 gateway)
217{
218 return;
219}
220
221static inline int cipso_v4_getattr(const unsigned char *cipso,
222 struct netlbl_lsm_secattr *secattr)
223{
224 return -ENOSYS;
225}
226
227static inline int cipso_v4_sock_setattr(struct sock *sk,
228 const struct cipso_v4_doi *doi_def,
229 const struct netlbl_lsm_secattr *secattr)
230{
231 return -ENOSYS;
232}
233
234static inline void cipso_v4_sock_delattr(struct sock *sk)
235{
236}
237
238static inline int cipso_v4_sock_getattr(struct sock *sk,
239 struct netlbl_lsm_secattr *secattr)
240{
241 return -ENOSYS;
242}
243
244static inline int cipso_v4_req_setattr(struct request_sock *req,
245 const struct cipso_v4_doi *doi_def,
246 const struct netlbl_lsm_secattr *secattr)
247{
248 return -ENOSYS;
249}
250
251static inline void cipso_v4_req_delattr(struct request_sock *req)
252{
253 return;
254}
255
256static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb,
257 const struct cipso_v4_doi *doi_def,
258 const struct netlbl_lsm_secattr *secattr)
259{
260 return -ENOSYS;
261}
262
263static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb)
264{
265 return -ENOSYS;
266}
267
268static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
269 struct netlbl_lsm_secattr *secattr)
270{
271 return -ENOSYS;
272}
273
274static inline unsigned char *cipso_v4_optptr(const struct sk_buff *skb)
275{
276 return NULL;
277}
278
279static inline int cipso_v4_validate(const struct sk_buff *skb,
280 unsigned char **option)
281{
282 unsigned char *opt = *option;
283 unsigned char err_offset = 0;
284 u8 opt_len = opt[1];
285 u8 opt_iter;
286 u8 tag_len;
287
288 if (opt_len < 8) {
289 err_offset = 1;
290 goto out;
291 }
292
293 if (get_unaligned_be32(&opt[2]) == 0) {
294 err_offset = 2;
295 goto out;
296 }
297
298 for (opt_iter = 6; opt_iter < opt_len;) {
299 if (opt_iter + 1 == opt_len) {
300 err_offset = opt_iter;
301 goto out;
302 }
303 tag_len = opt[opt_iter + 1];
304 if ((tag_len == 0) || (tag_len > (opt_len - opt_iter))) {
305 err_offset = opt_iter + 1;
306 goto out;
307 }
308 opt_iter += tag_len;
309 }
310
311out:
312 *option = opt + err_offset;
313 return err_offset;
314
315}
316#endif /* CONFIG_NETLABEL */
317
318#endif /* _CIPSO_IPV4_H */
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * CIPSO - Commercial IP Security Option
4 *
5 * This is an implementation of the CIPSO 2.2 protocol as specified in
6 * draft-ietf-cipso-ipsecurity-01.txt with additional tag types as found in
7 * FIPS-188, copies of both documents can be found in the Documentation
8 * directory. While CIPSO never became a full IETF RFC standard many vendors
9 * have chosen to adopt the protocol and over the years it has become a
10 * de-facto standard for labeled networking.
11 *
12 * Author: Paul Moore <paul@paul-moore.com>
13 */
14
15/*
16 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
17 */
18
19#ifndef _CIPSO_IPV4_H
20#define _CIPSO_IPV4_H
21
22#include <linux/types.h>
23#include <linux/rcupdate.h>
24#include <linux/list.h>
25#include <linux/net.h>
26#include <linux/skbuff.h>
27#include <net/netlabel.h>
28#include <net/request_sock.h>
29#include <linux/atomic.h>
30#include <linux/refcount.h>
31#include <asm/unaligned.h>
32
33/* known doi values */
34#define CIPSO_V4_DOI_UNKNOWN 0x00000000
35
36/* standard tag types */
37#define CIPSO_V4_TAG_INVALID 0
38#define CIPSO_V4_TAG_RBITMAP 1
39#define CIPSO_V4_TAG_ENUM 2
40#define CIPSO_V4_TAG_RANGE 5
41#define CIPSO_V4_TAG_PBITMAP 6
42#define CIPSO_V4_TAG_FREEFORM 7
43
44/* non-standard tag types (tags > 127) */
45#define CIPSO_V4_TAG_LOCAL 128
46
47/* doi mapping types */
48#define CIPSO_V4_MAP_UNKNOWN 0
49#define CIPSO_V4_MAP_TRANS 1
50#define CIPSO_V4_MAP_PASS 2
51#define CIPSO_V4_MAP_LOCAL 3
52
53/* limits */
54#define CIPSO_V4_MAX_REM_LVLS 255
55#define CIPSO_V4_INV_LVL 0x80000000
56#define CIPSO_V4_MAX_LOC_LVLS (CIPSO_V4_INV_LVL - 1)
57#define CIPSO_V4_MAX_REM_CATS 65534
58#define CIPSO_V4_INV_CAT 0x80000000
59#define CIPSO_V4_MAX_LOC_CATS (CIPSO_V4_INV_CAT - 1)
60
61/*
62 * CIPSO DOI definitions
63 */
64
65/* DOI definition struct */
66#define CIPSO_V4_TAG_MAXCNT 5
67struct cipso_v4_doi {
68 u32 doi;
69 u32 type;
70 union {
71 struct cipso_v4_std_map_tbl *std;
72 } map;
73 u8 tags[CIPSO_V4_TAG_MAXCNT];
74
75 refcount_t refcount;
76 struct list_head list;
77 struct rcu_head rcu;
78};
79
80/* Standard CIPSO mapping table */
81/* NOTE: the highest order bit (i.e. 0x80000000) is an 'invalid' flag, if the
82 * bit is set then consider that value as unspecified, meaning the
83 * mapping for that particular level/category is invalid */
84struct cipso_v4_std_map_tbl {
85 struct {
86 u32 *cipso;
87 u32 *local;
88 u32 cipso_size;
89 u32 local_size;
90 } lvl;
91 struct {
92 u32 *cipso;
93 u32 *local;
94 u32 cipso_size;
95 u32 local_size;
96 } cat;
97};
98
99/*
100 * Sysctl Variables
101 */
102
103#ifdef CONFIG_NETLABEL
104extern int cipso_v4_cache_enabled;
105extern int cipso_v4_cache_bucketsize;
106extern int cipso_v4_rbm_optfmt;
107extern int cipso_v4_rbm_strictvalid;
108#endif
109
110/*
111 * DOI List Functions
112 */
113
114#ifdef CONFIG_NETLABEL
115int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
116 struct netlbl_audit *audit_info);
117void cipso_v4_doi_free(struct cipso_v4_doi *doi_def);
118int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info);
119struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
120void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def);
121int cipso_v4_doi_walk(u32 *skip_cnt,
122 int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
123 void *cb_arg);
124#else
125static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
126 struct netlbl_audit *audit_info)
127{
128 return -ENOSYS;
129}
130
131static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
132{
133 return;
134}
135
136static inline int cipso_v4_doi_remove(u32 doi,
137 struct netlbl_audit *audit_info)
138{
139 return 0;
140}
141
142static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
143{
144 return NULL;
145}
146
147static inline int cipso_v4_doi_walk(u32 *skip_cnt,
148 int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
149 void *cb_arg)
150{
151 return 0;
152}
153#endif /* CONFIG_NETLABEL */
154
155/*
156 * Label Mapping Cache Functions
157 */
158
159#ifdef CONFIG_NETLABEL
160void cipso_v4_cache_invalidate(void);
161int cipso_v4_cache_add(const unsigned char *cipso_ptr,
162 const struct netlbl_lsm_secattr *secattr);
163#else
164static inline void cipso_v4_cache_invalidate(void)
165{
166 return;
167}
168
169static inline int cipso_v4_cache_add(const unsigned char *cipso_ptr,
170 const struct netlbl_lsm_secattr *secattr)
171{
172 return 0;
173}
174#endif /* CONFIG_NETLABEL */
175
176/*
177 * Protocol Handling Functions
178 */
179
180#ifdef CONFIG_NETLABEL
181void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
182int cipso_v4_getattr(const unsigned char *cipso,
183 struct netlbl_lsm_secattr *secattr);
184int cipso_v4_sock_setattr(struct sock *sk,
185 const struct cipso_v4_doi *doi_def,
186 const struct netlbl_lsm_secattr *secattr);
187void cipso_v4_sock_delattr(struct sock *sk);
188int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
189int cipso_v4_req_setattr(struct request_sock *req,
190 const struct cipso_v4_doi *doi_def,
191 const struct netlbl_lsm_secattr *secattr);
192void cipso_v4_req_delattr(struct request_sock *req);
193int cipso_v4_skbuff_setattr(struct sk_buff *skb,
194 const struct cipso_v4_doi *doi_def,
195 const struct netlbl_lsm_secattr *secattr);
196int cipso_v4_skbuff_delattr(struct sk_buff *skb);
197int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
198 struct netlbl_lsm_secattr *secattr);
199unsigned char *cipso_v4_optptr(const struct sk_buff *skb);
200int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option);
201#else
202static inline void cipso_v4_error(struct sk_buff *skb,
203 int error,
204 u32 gateway)
205{
206 return;
207}
208
209static inline int cipso_v4_getattr(const unsigned char *cipso,
210 struct netlbl_lsm_secattr *secattr)
211{
212 return -ENOSYS;
213}
214
215static inline int cipso_v4_sock_setattr(struct sock *sk,
216 const struct cipso_v4_doi *doi_def,
217 const struct netlbl_lsm_secattr *secattr)
218{
219 return -ENOSYS;
220}
221
222static inline void cipso_v4_sock_delattr(struct sock *sk)
223{
224}
225
226static inline int cipso_v4_sock_getattr(struct sock *sk,
227 struct netlbl_lsm_secattr *secattr)
228{
229 return -ENOSYS;
230}
231
232static inline int cipso_v4_req_setattr(struct request_sock *req,
233 const struct cipso_v4_doi *doi_def,
234 const struct netlbl_lsm_secattr *secattr)
235{
236 return -ENOSYS;
237}
238
239static inline void cipso_v4_req_delattr(struct request_sock *req)
240{
241 return;
242}
243
244static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb,
245 const struct cipso_v4_doi *doi_def,
246 const struct netlbl_lsm_secattr *secattr)
247{
248 return -ENOSYS;
249}
250
251static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb)
252{
253 return -ENOSYS;
254}
255
256static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
257 struct netlbl_lsm_secattr *secattr)
258{
259 return -ENOSYS;
260}
261
262static inline unsigned char *cipso_v4_optptr(const struct sk_buff *skb)
263{
264 return NULL;
265}
266
267static inline int cipso_v4_validate(const struct sk_buff *skb,
268 unsigned char **option)
269{
270 unsigned char *opt = *option;
271 unsigned char err_offset = 0;
272 u8 opt_len = opt[1];
273 u8 opt_iter;
274 u8 tag_len;
275
276 if (opt_len < 8) {
277 err_offset = 1;
278 goto out;
279 }
280
281 if (get_unaligned_be32(&opt[2]) == 0) {
282 err_offset = 2;
283 goto out;
284 }
285
286 for (opt_iter = 6; opt_iter < opt_len;) {
287 if (opt_iter + 1 == opt_len) {
288 err_offset = opt_iter;
289 goto out;
290 }
291 tag_len = opt[opt_iter + 1];
292 if ((tag_len == 0) || (tag_len > (opt_len - opt_iter))) {
293 err_offset = opt_iter + 1;
294 goto out;
295 }
296 opt_iter += tag_len;
297 }
298
299out:
300 *option = opt + err_offset;
301 return err_offset;
302
303}
304#endif /* CONFIG_NETLABEL */
305
306#endif /* _CIPSO_IPV4_H */